Electric lamp holder and the like



April 7, 3- s. *SULLAM 2,317,863

ELECTRIC LAMPE'HOLDER AND.-THE LIKE Filed Aug. 4, 1941 zz/zkion Patented Apr. 27, 1943 I 2,317,863 ELECTRIC L'Aim HOLDER AND THE LIKE Samuel Daniel Sullam, London, England Application August 4, 1941, Serial No.

In Great Britain July 3, 1941 2 Claims.

This invention relates to electric lamp holders and the like, its object being to provide an improved construction which will be labour saving and will permit of ready inspection of the leads and electrical connections when required.

To attain these objects according to the present invention, the holder is divided into two longitudinal sections and preferably in halves, each formed with a lateral flange or lip for the purpose hereinafter explained.

These two sections are simply held together by a screw threaded shade ring which threads onto a screwed portion of the periphery or external surface of each section or two rings may be used if desired.

A longitudinal rebate or recess is advantageously provided along the edges of the two sections so as to interfit or interlock.

The flange or lip above referred to forms an abutment against which the screwed ring or rings can sit or against which a lamp shade or the like can be held by the aforesaid screwed ring or rings in known manner per se.

The upper end of the holder has a short neck which may be internally or externally screw threaded, or both, to take the thimble or cap holding the cord grips or for any other desired purposes.

The holder thus constructed houses either the ordinary bayonet type insulated connector or a screw threaded fitting for Edison type lamps.

The connector may, however be formed integral with the holder, and the holder is preferably of synthetic resinous material, the metal parts of the connector for the leads being moulded into the resinous material.

Where the metal connector is moulded into the holder, one lead from the mains passes to a terminal, socket or the like formed on the inside wall of one section, and the other lead passes to a similar connection on the inside wall of the other half, the leads being secured by screws in known manner.

Where the holder is simply intended to receive the ordinary internal connector to which the leads are secured, a ridge, projection or stud may be formed on the inside of each half of the holder to serve as locators for the connector.

At the upper part of the inside wall of the holder there may be provided grooves integral with the two sections, to receive the leads, in such a manner that when the two parts of the holder are assembled the leads will be gripped tightly in such grooves.

For screw type lamps one lead passes to a centre terminal or the inside of one section and is adapted to co-act with the centre contact of thelamp bulb and the other lead is connected with a metal screw moulded into the material of the other section of the holder.

The lamp holder can be mouth at the lower end.

With this holder there are no small external screws to be manipulated as in some commercial lamp holders and, as will be readily appreciated, the holder can be quickly opened so that the leads and their connections can be inspected.

The invention is shown by way of example in the accompanying drawing in which:

Figure 1 is a vertical section of one form of construction; Fig. 2 is a cross section on the line lI-II of Fig. 1; Fig. 3 is a vertical section of another form of construction; Fig. 4 shows a vertical section of a fragment of a further form; Fig. 5 shows a plan of Fig. 4 to an enlarged scale; Fig. 6 shows a further modification.

In the drawing the lamp holder casing is divided longitudinally into two halves A, the adjoining longitudinal edges B being adapted to interlock as shown in Fig. 2 by forming a recess, tongue or the like. Each casing part has a flange C and an externally screw-threaded portion D for the reception of a screw-threaded ring E which secures both parts firmly in position. A second ring E may be provided or a ring F may be fitted on an externally screw-threaded neck portion G. The usual metal part H formed with bayonet slots or a screw thread and which receives the insulated connector for the leads rests on a lip I formed on each casing part which may also form or serve as stops to prevent unintentional rotation thereof.

In the construction shown at Fig. 3 the neck F is both internally and externally screw-threaded and receives a nipple J but the external screw thread could be dispensed with. It is shown for use in Edison type lamps. Each part of the easing has a terminal K for the leads and one of these terminals has an arm L to contact with the centre contact of this type of lamp.

The screwed ring E may abut against the flange C or may secure therebetween a shade E if desired.

As shown in Figs. 4. and 5 the neck F may be solid and formed with grooves through which can pass the leads to the internal terminals K in such a manner that when the two parts are held together by the ring or rings E, the leads will be firmly gripped. In Fig. 6 the lamp holder is shown secured to a batten fitting M which is shaped somewhat bellthereof firmly together without 1. A lamp holder having electric lamps com 7' prising a casing moulded in two identical longitudinal sections, a tongue and groove engage-' flange with flared end on ment for said sections, a each section, a screw thread on each section below the flange and a screw threaded ring abutting against said flange to engage the screw threads on the casing and secure the two parts thereof firmly together without extraneous screws, a terminal on the internal surface of each casing part to receive the electric leads, a solid longitudinal grooves neck portion projecting from each section and longitudinal grooves therein to receive and tightly grip the electric leads therein when the two parts of the casing are secured together.

2. A lamp holder having electric lamps comprising a casing moulded in two identical longitudinal sections, a tongue and groove engagement for said sections, a flange with flared end on each section, a screw thread on each section below the flange and a screw threaded riing abutting against said flange to engage the screw threads on the casing and secure the two parts extraneous screws, a terminal on the internal surface of each casing part to receive the electric leads, a solid neck portion projecting from each section and therein to receive and tightly grip the electric leads therein when the two parts of the casing are secured together, and a metal screw thread for the lamp cap moulded in each part of a casing formed of insulating material;

SAMUEL DANIEL SULLAM. 

